mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-13 22:58:42 +00:00
b0e97617d9
Backport some changes from branch oz-parametric-hashes. Replace naive hash function for IPv6 addresses, fix hashing of VPNx (where upper half of RD was ignored), fix hashing of MPLS labels (where identity was used).
233 lines
6.0 KiB
C
233 lines
6.0 KiB
C
/*
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* BIRD Library
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*
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* (c) 1998--2004 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BIRDLIB_H_
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#define _BIRD_BIRDLIB_H_
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#include "lib/alloca.h"
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/* Ugly structure offset handling macros */
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struct align_probe { char x; long int y; };
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#define OFFSETOF(s, i) ((size_t) &((s *)0)->i)
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#define SKIP_BACK(s, i, p) ((s *)((char *)p - OFFSETOF(s, i)))
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#define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1))
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#define CPU_STRUCT_ALIGN (sizeof(struct align_probe))
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/* Utility macros */
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#define MIN_(a,b) (((a)<(b))?(a):(b))
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#define MAX_(a,b) (((a)>(b))?(a):(b))
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#ifndef PARSER
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#undef MIN
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#undef MAX
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#define MIN(a,b) MIN_(a,b)
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#define MAX(a,b) MAX_(a,b)
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#endif
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#define ROUND_DOWN_POW2(a,b) ((a) & ~((b)-1))
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#define ROUND_UP_POW2(a,b) (((a)+((b)-1)) & ~((b)-1))
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#define U64(c) UINT64_C(c)
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#define ABS(a) ((a)>=0 ? (a) : -(a))
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#define DELTA(a,b) (((a)>=(b))?(a)-(b):(b)-(a))
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
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#define BYTES(n) ((((uint) (n)) + 7) / 8)
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#define CALL(fn, args...) ({ if (fn) fn(args); })
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#define ADVANCE(w, r, l) ({ r -= (l); w += (l); })
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static inline int uint_cmp(uint i1, uint i2)
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{ return (int)(i1 > i2) - (int)(i1 < i2); }
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static inline int u64_cmp(u64 i1, u64 i2)
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{ return (int)(i1 > i2) - (int)(i1 < i2); }
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/* Bitfield macros */
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/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
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#define BIT32_VAL(p) (((u32) 1) << ((p) % 32))
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#define BIT32_TEST(b,p) ((b)[(p)/32] & BIT32_VAL(p))
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#define BIT32_SET(b,p) ((b)[(p)/32] |= BIT32_VAL(p))
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#define BIT32_CLR(b,p) ((b)[(p)/32] &= ~BIT32_VAL(p))
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#define BIT32_ZERO(b,l) memset((b), 0, (l)/8)
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/* The same, but counting bits from MSB */
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#define BIT32R_VAL(p) ((((u32) 1) << 31) >> ((p) % 32))
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#define BIT32R_TEST(b,p) ((b)[(p)/32] & BIT32R_VAL(p))
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#define BIT32R_SET(b,p) ((b)[(p)/32] |= BIT32R_VAL(p))
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#define BIT32R_CLR(b,p) ((b)[(p)/32] &= ~BIT32R_VAL(p))
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#define BIT32R_ZERO(b,l) memset((b), 0, (l)/8)
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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/* Macros for gcc attributes */
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#define NORET __attribute__((noreturn))
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#define UNUSED __attribute__((unused))
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#define PACKED __attribute__((packed))
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#define NONNULL(...) __attribute__((nonnull((__VA_ARGS__))))
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#define STATIC_ASSERT(EXP) _Static_assert(EXP, #EXP)
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#define STATIC_ASSERT_MSG(EXP,MSG) _Static_assert(EXP, MSG)
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#ifndef HAVE_THREAD_LOCAL
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#define _Thread_local
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#endif
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/* Microsecond time */
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typedef s64 btime;
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//typedef s64 bird_clock_t;
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#define S_ * (btime) 1000000
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#define MS_ * (btime) 1000
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#define US_ * (btime) 1
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#define TO_S /1000000
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#define TO_MS /1000
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#define TO_US /1
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#ifndef PARSER
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#define S S_
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#define MS MS_
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#define US US_
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#define NS /1000
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#endif
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#define TIME_INFINITY ((s64) 0x7fffffffffffffff)
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/* Rate limiting */
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struct tbf {
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btime timestamp; /* Last update */
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u64 count; /* Available micro-tokens */
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u16 burst; /* Max number of tokens */
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u16 rate; /* Rate of replenishment (tokens / sec) */
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u32 drop; /* Number of failed request since last successful */
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};
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/* Default TBF values for rate limiting log messages */
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#define TBF_DEFAULT_LOG_LIMITS { .rate = 1, .burst = 5 }
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int tbf_limit(struct tbf *f);
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/* Logging and dying */
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typedef struct buffer {
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byte *start;
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byte *pos;
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byte *end;
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} buffer;
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#define STACK_BUFFER_INIT(buf,size) \
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do { \
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buf.start = alloca(size); \
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buf.pos = buf.start; \
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buf.end = buf.start + size; \
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} while(0)
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#define LOG_BUFFER_INIT(buf) \
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STACK_BUFFER_INIT(buf, LOG_BUFFER_SIZE)
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#define LOG_BUFFER_SIZE 1024
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#define log log_msg
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void log_commit(int class, buffer *buf);
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void log_msg(const char *msg, ...);
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void log_rl(struct tbf *rl, const char *msg, ...);
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void die(const char *msg, ...) NORET;
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void bug(const char *msg, ...) NORET;
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#define L_DEBUG "\001" /* Debugging messages */
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#define L_TRACE "\002" /* Protocol tracing */
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#define L_INFO "\003" /* Informational messages */
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#define L_REMOTE "\004" /* Remote protocol errors */
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#define L_WARN "\005" /* Local warnings */
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#define L_ERR "\006" /* Local errors */
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#define L_AUTH "\007" /* Authorization failed etc. */
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#define L_FATAL "\010" /* Fatal errors */
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#define L_BUG "\011" /* BIRD bugs */
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void debug(const char *msg, ...); /* Printf to debug output */
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void debug_safe(const char *msg); /* Printf to debug output, async-safe */
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/* Debugging */
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#if defined(LOCAL_DEBUG) || defined(GLOBAL_DEBUG)
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#define DBG(x, y...) debug(x, ##y)
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#else
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#define DBG(x, y...) do { } while(0)
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#endif
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#define ASSERT_DIE(x) do { if (!(x)) bug("Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
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#define EXPENSIVE_CHECK(x) /* intentionally left blank */
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#ifdef DEBUGGING
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#define ASSERT(x) ASSERT_DIE(x)
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#define ASSUME(x) ASSERT_DIE(x)
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#ifdef ENABLE_EXPENSIVE_CHECKS
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#undef EXPENSIVE_CHECK
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#define EXPENSIVE_CHECK(x) ASSERT_DIE(x)
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#endif
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#else
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#define ASSERT(x) do { if (!(x)) log(L_BUG "Assertion '%s' failed at %s:%d", #x, __FILE__, __LINE__); } while(0)
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#define ASSUME(x) /* intentionally left blank */
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#endif
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#ifdef DEBUGGING
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asm(
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".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n"
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".byte 1\n" /* Python */
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".asciz \"bird-gdb.py\"\n"
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".popsection\n"
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);
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#endif
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/* Pseudorandom numbers */
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u32 random_u32(void);
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void random_init(void);
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void random_bytes(void *buf, size_t size);
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/* Hashing */
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/* Constant parameter for non-parametrized hashes */
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#define HASH_PARAM 2902958171u
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/* Precomputed powers of HASH_PARAM */
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#define HASH_PARAM1 ((u64) HASH_PARAM)
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#define HASH_PARAM2 (HASH_PARAM1 * HASH_PARAM)
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#define HASH_PARAM3 (HASH_PARAM2 * HASH_PARAM)
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#define HASH_PARAM4 (HASH_PARAM3 * HASH_PARAM)
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/* Reduce intermediate 64-bit value to final 32-bit value */
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static inline u32 hash_value(u64 a)
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{ return ((u32) a) ^ ((u32) (a >> 32)); }
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static inline u64 u32_hash0(u32 v, u32 p, u64 acc)
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{ return (acc + v) * p; }
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static inline u64 u64_hash0(u64 v, u32 p, u64 acc)
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{ return u32_hash0(v >> 32, p, u32_hash0(v, p, acc)); }
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static inline u32 u64_hash(u64 v)
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{ return hash_value(u64_hash0(v, HASH_PARAM, 0)); }
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#endif
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